linux-kernel - [PATCH] sched/debug: Print slice length for fair tasks

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Message-ID: <453349b1-1637-42f5-a7b2-2385392b5956@arm.com>
Date: Wed, 29 Jan 2025 17:59:44 +0000
From: Christian Loehle <christian.loehle@....com>
To: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
 Peter Zijlstra <peterz@...radead.org>
Cc: Ingo Molnar <mingo@...hat.com>, Juri Lelli <juri.lelli@...hat.com>,
 Steven Rostedt <rostedt@...dmis.org>,
 Vincent Guittot <vincent.guittot@...aro.org>,
 Valentin Schneider <vschneid@...hat.com>,
 Petre-Ionut Tudor <petre-ionut.tudor@....com>
Subject: [PATCH] sched/debug: Print slice length for fair tasks

With commit 857b158dc5e8 ("sched/eevdf: Use sched_attr::sched_runtime
to set request/slice suggestion") we have the userspace per-task tunable
slice length so print it in /proc/$PID/sched.

Signed-off-by: Christian Loehle <christian.loehle@....com>
---
 kernel/sched/debug.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/kernel/sched/debug.c b/kernel/sched/debug.c
index fd7e85220715..ef047add7f9e 100644
--- a/kernel/sched/debug.c
+++ b/kernel/sched/debug.c
@@ -1262,6 +1262,8 @@ void proc_sched_show_task(struct task_struct *p, struct pid_namespace *ns,
 	if (task_has_dl_policy(p)) {
 		P(dl.runtime);
 		P(dl.deadline);
+	} else if (fair_policy(p->policy)) {
+		P(se.slice);
 	}
 #ifdef CONFIG_SCHED_CLASS_EXT
 	__PS("ext.enabled", task_on_scx(p));
-- 
2.34.1